ĐK: \(x\ne\dfrac{\pi}{4}+\dfrac{k\pi}{2}\)
\(tan\left(x-\dfrac{\pi}{4}\right)=tan2x\)
\(\Leftrightarrow2x=x-\dfrac{\pi}{4}+k\pi\)
\(\Leftrightarrow x=-\dfrac{\pi}{4}+k\pi\)
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